package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.apache.http.impl.client.HttpClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    private static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid=getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //查询用户是否在数据库内
        User user = userMapper.getByOpenid(openid);

        //判断当前用户是否为新用户 如果是新用户 自动完成注册
        if(user==null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取微信用户openid
     * @param Code
     * @return
     */
    private String getOpenid(String Code){
        //调用微信接口服务，获得当前微信用户的openid
        Map<String, String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",Code);
        map.put("grant_type","authorization_code");

        //发送 HTTP GET 请求到微信登录接口
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        //将 JSON 字符串解析为 JSON 对象
        JSONObject jsonObject= JSON.parseObject(json);
        //从 JSON 对象中提取用户 OpenID
        String openid = jsonObject.getString("openid");

        return openid;
    }

}
